Twenty-four-hour pattern of ventricular excitation rhythm in resting normal human subjects.

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Abstract
Using a biotelemetry system, the ECG was continuously measured over 24 h in a given environmental condition in 8 normal human subjects. The frequency of ventricular excitation rhythm (VER) was obtained from inverse of R-R interval of ECG. The variation of VER over 24 h in resting normal subjects with different ages was studied. The averaged frequency of VER per day (VERd) and its relative coefficient of variation (CV) ranged from 1.44-1.01 Hz (mean: 1.24 Hz) and 26-10% (mean: 20%) with age of 10-73 yr (mean: 42 yr). VERd and CV showed a tendency to decrease with age. The VERd histogram showed not a normal distribution but a multimodal distribution. Two or 3 large positive deviations, denoted as L, N and H modal components, from the normal distribution curve were detected. The mode of L and H modal components was 1.01 and 1.37 Hz, respectively. The frequency distribution of L and H modal components changed with relation to a circadian rhythm and sleep-wakefulness cycles. An hourly histogram of ventricular excitation rhythm (VERh) frequently showed an unimodal distribution and the relative coefficient of variation of VERh ranged from 7.9-13.3% which was smaller than that of CV. The mode of VERh histogram changed in association with the circadian rhythm, the sleep-wakefulness cycles and a fluctuation period of 2 to 3 h.

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